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Self-sustained oscillations of a confined impinging jet

Varieras, Didier and Brancher, Pierre and Giovannini, André Self-sustained oscillations of a confined impinging jet. (2007) Flow Turbulence and Combustion, 78 (1). 1-15. ISSN 1386-6184

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Official URL: http://dx.doi.org/10.1007/s10494-006-9017-7

Abstract

The present paper investigates the dynamics of a laminar plane jet impinging on a flat plate in a channel. An experimental parametric study is carried out to determine the flow regimes at different levels of confinement and Reynolds numbers. For very confined jets, the flow is steady whatever the Reynolds number. The overall structure of the flow is symmetric with respect to the jet axis and is characterized by the presence of recirculation zones at the channel walls. The dynamics is radically different for less confined jets. Above a critical Reynolds number, the flow bifurcates in the form of an oscillating flapping mode of the impinging jet. Analyses of the experimental results provide with a quantitative characterization of this regime in terms of amplitude, wavelength and frequency. This self-oscillating bifurcated flow induces strong sweepings of the target plate by the jet and intense vortex dipole ejections from the impacted wall. Such a regime is expected to be particularly useful in the enhancement of the local heat transfer at relatively low cost in terms of flow rate.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The original PDF of the article can be found at : https://link.springer.com/article/10.1007%2Fs10494-006-9017-7
HAL Id:hal-01728783
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut National des Sciences Appliquées de Lyon - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
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Deposited By: Pierre BRANCHER
Deposited On:12 Mar 2018 08:32

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